User's Manual

Receiver Model : WH2802
Sensor Model : WH32G
Version 1.0 Page 16
4.7.3 Weather Forecasting Description and Limitations
In general, if the rate of change of pressure increases, the weather is generally improving (sunny to
partly cloudy). If the rate of change of pressure decreases, the weather is generally degrading
(cloudy, rainy or stormy). If the rate of change is relatively steady, it will read partly cloudy.
The reason the current conditions do not match the forecast icon is because the forecast is a
prediction 24-48 hours in advance. In most locations, this prediction is only 70% accurate and it is a
good idea to consult the National Weather Service for more accurate weather forecasts. In some
locations, this prediction may be less or more accurate. However, it is still an interesting educational
tool for learning why the weather changes.
The National Weather Service (and other weather services such as Accuweather and The Weather
Channel) have many tools at their disposal to predict weather conditions, including weather radar,
weather models, and detailed mapping of ground conditions.
4.7.4 Moon Phase
The following moon phases are displayed based on the calendar date and your northern vs
southern hemisphere, as shown in Figure 15.
Northern Hemisphere:
New
Waxing
Crescent
First
Quarter
Waxing
Gibbous
Full
Waning
Gibbous
Third
Quarter
Waning
New
Southern Hemisphere:
New
Waxing
Crescent
First
Quarter
Waxing
Gibbous
Full
Waning
Gibbous
Third
Quarter
Waning
New
Figure 15
4.7.5 Pressure Tendency Arrows
The forecast trend arrow updates every 30 minutes. The trend reflects changes in pressure (1 hPa)
over the past 3 hours.
Pressure is rising
Pressure is unchanged
Pressure is falling
Figure 16
4.7.6 Rate of Change of Pressure Graph
The rate of change of pressure graphic is shown to the left of the barometric pressure and signifies
the difference between the daily average pressure and the 30 day average (in hPa).